Posted by WALTER SCHWETZ (68.78.41.204) on May 15, 2008 at 18:52:05:
In Reply to: Duplex Seal? posted by Abe Dale on April 03, 2008 at 12:08:16:
: We've had a request from a customer for a duplex seal. I am unfamiliar with this term as is the rest of the shop. Any idea what they are requesting? We typically use a nickel acetate seal. Requested spec is Mil-A-8625 Type II Class 2 with duplex seal.
Basically just a boiling water seal after the nickel acetate. Like the days before nickel acetate, boiling water seals aluminum. Nickel acetate was added to lower temperature and energy costs and improve overall lightfastness.
todays nickel acetate seals pretty much shouldnt need duplex anymore